mail.node
Class ID

java.lang.Object
  mail.node.ID

Direct Known Subclasses:

NameID

public class ID
extends java.lang.Object

Author:

Arne Müller

Field Summary

private byte[]	id
static int	ID_LENGTH Length of the ID in bytes.

Constructor Summary

ID(byte[] keydata)
creates the ID out of the given keydata of a public key the algorithm is not very complex, so if parts of the key are known, the data of this ID can easily be used to recreate the key

ID(java.lang.String s)

Method Summary

int	distance(ID other) calculates the Hamming-distance between two ID's.
boolean	equals(java.lang.Object o)
private static byte[]	fromHex(java.lang.String s)
private static int	fromHexChar(char c)
java.lang.String	getStoreName()
int	hashCode()
java.lang.String	send()
private static char	toHexChar(int b)
java.lang.String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

ID_LENGTH

public static final int ID_LENGTH

Length of the ID in bytes.
A ID-size of 256 bits allows 2^256 different ID's, assumed there are 2^64 users (which will never happen) the probability for each two users to have the same key is 2^-256 there are about (2^64)^2 = 2^128 pairs of users -> the probability that any two users have the same key is less than 2^-256 * 2^128 = 2^-128 thus the probability is very small and we can assume that everybody got a different ID

See Also:

Constant Field Values

id

private final byte[] id

Constructor Detail

ID

public ID(byte[] keydata)

creates the ID out of the given keydata of a public key the algorithm is not very complex, so if parts of the key are known, the data of this ID can easily be used to recreate the key

Parameters:

keydata -

ID

public ID(java.lang.String s)

Method Detail

distance

public final int distance(ID other)

calculates the Hamming-distance between two ID's. The Hamming-distance is defined as the number of bits that need to be flipped to get the other key

Parameters:

other - ID to calculate the distance to

Returns:

the Hamming-distance

toHexChar

private static char toHexChar(int b)

fromHexChar

private static int fromHexChar(char c)

fromHex

private static byte[] fromHex(java.lang.String s)

send

public java.lang.String send()

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

hashCode

public final int hashCode()

Overrides:

hashCode in class java.lang.Object

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

getStoreName

public java.lang.String getStoreName()